Brake-shoe.



PATENTED MAY 2, 1905.

W. M. SIMPSON.

BRAKE SHOE.

APPLIO ATION FILED MAR.18,1 904.

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No. 788,559. PATENTED MAY 2, 1905.

" W. M. SIMPSON.

BRAKE SHOE.

APPLICATION FILED MAR.18,190 4.

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UNITED STATES Patented May 2, 1905.

PATENT OFFICE.

WVILLIAM M. SIMPSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE RAIL- WAY MATERIALS COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

BRAKE-SHOE- SPECIFICATION forming part of Letters Patent No. 788,559, dated May 2, 1905.

i Application filed March 18, 1904. Serial No. 198,825.

To all whom it may concern:

- Be it known that 1, WILLIAM M. SIMPsoN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Brake-Shoes, of which the following is a specification.

This invention relates to brake-shoes, and has for its object to provide a shoe of great strength, mileage, and durability and with the necessary frictional efficiency to meet the specifications for frictional quality which have been adopted by the Master Car-BuildersAssociation.

With these and other ends in view Icon template providing a composite brake-shoe con sisting of soft-metal inserts embedded in "a comparatively hard metal body, the inserts be ing secured together and the body of the shoe strengthened by metal strips located at or adjacent to the back of the shoe.

7 My invention is capable of embodiment in various forms, and for the purpose of illustration I have shown several forms in the accompanying drawings, in which- Figure 1 illustrates a pair of inserts connected by the strips. Fig. 2 is aface view of a shoe with the strips shown in broken lines. Fig. 3 shows another form of insert. Figs. 4 and 5 are sectional views on the lines 44 and 5 5, respectively, of Fig. 1, the body being indicated by broken lines. Fig. 6 shows in transverse section several different kinds of strips which may be used. tudinal sectional view of the shoe shown in Fig. 2. Fig. 8 shows three strips connecting a pair of inserts. Fig. 9 shows an insert of substantially herring-bone shape. Figs. 10 and 11 are transverse sectional views taken approximately on the line 5 5 of Fig. 1 and showing how the insert may be made with openings to receive the strips instead of being cast on the strips. Fig. 12 is a sectional view showing a single strip.

Like characters of reference designate cor responding parts inthe several figures of the drawings, and referring thereto 20 indicates the strips, 21 the inserts, and 22 the body of the shoe. The strips may be made of ordinary merchant-iron and in any suitable form-such, for example, as illustrated in Fig. 6-in which a indicates a half-oval strip, a rectangular strip, and c and d strips with beveled faces. I do not limit myself to the use of strips of any particular form, although I have found that half-oval or band-iron strips a and beveled strips substantially like 0 are especially satisfactory. I prefer to use two or three strips, but do not limit myself to any particular number, and I may make them of Wrought-- iron, malleable iron, steel, or other metal.

The inserts may be molded on the strips in the manner shown in Figs. 1, I, and 5, the insert metal being allowed to run up between and spread out more or less crosswise under and over the strips in the form of a crown 23 to fasten the inserts and the strips together. The crown extends somewhat above the body part of the insert, so that the metal of the body of the shoe will flow into the recess 22 between the strips and the body of the insert and formed by the undercut sides of the crown to make a locking engagement between the insert and body of the shoe. Instead of casting the inserts on the strips, as just described, I may cast inserts with openings into which the strips may afterward be inserted, and in Fig. 10 I have shown an insert provided with shoulders 23, which form openings to receive the strips, and in Fig. 11 I have shown an insert provided with openings 24 to receive the strips. I

I provide a plurality of inserts, preferably two, the total face area of which is sufficient to provide the requisite degree of friction. Each of the inserts has approximately the same transverse sectional area throughout its length and may be made in the reflexed angular form shown in Figs. 1, 2, and 8, in the sinuous form shown in Fig. 3, in the herringbone form shown in Fig. 9, or in any other suitable form. The soft metal of the inserts is thus distributed in a comparatively even manner throughout the major portion of the wearing-face of the shoe at all times without weakening the shoe. The sides of the inserts may be beveled, as shown.

The inserts are first cast on or otherwise connected with the strips, and then the body of the shoe is cast on this skeleton with the faces of the inserts preferably exposed on the wearing-face of the shoe and the strips embedded in the shoe at or adjacent to the back thereof. In the casting operation the inserts will chill the body of the shoe at all points adjacent thereto and extended a more or less distance laterally therefrom, as indicated by the shading 22. In this way I provide a composite brake-shoe with a wearing-face consisting of soft-metal inserts inclosed within a comparatively hard body having extended chilled sections surrounding and adjacent to the inserts. The strips greatly strengthen the shoe and inseparably connect the inserts together and unite them with the body of the shoe, so that all dangeror liability of the inserts becoming dislodged from the body or of the shoe breaking and falling apart is prevented, and the life of the shoe is materially lengthened. The strips are located at or adjacent to the back of the shoe and are flatfaced, so that the shoe will have worn to extreme thinness before the strips are exposed and come in contact with the wheel, and thus maximum mileage is obtained.

I do not limit the invention to the precise form of inserts or strips nor to any particular way of fastening them together, because it will be readily understood that the invention is capable of being embodied in forms which differ specifically. but not generically from those illustrated in the drawings, and I desire to avail myself of all forms of embodiment which come within the scope of the invention. I

It is of course apparent that I may use the novel form of strips in connection with inserts and bodies which difier from those herein described both as regards their shape and the kind of metal. The relative proportions of the insert and body may be varied as desired to produce a greater degree of friction or a long-lived shoe, as desired. The insert may be made in any angular form, whether of a refieXed, sinuous, zigzag, or other shape, which will distribute the soft metal throughout the body of the shoe in a manner substantially like the inserts illustrated in the drawmgs.

As before stated, I do not limit myself to the number of strips employed, and in Fig. 12 I have illustrated a construction in which inserts 2,5 are connected by a single strip 26, and it is obvious that the single strip can be usedin connection with an insert having a crown 27, as shown in this figure, or in connection with an insert without the crown.

I claim 1. Abrake-shoe comprisingacomparatively hard metal body, angular-shaped soft-metal inserts embedded in said body, and strips connecting said inserts and located at or adjacent to the back of the shoe.

- 2. Abrake-shoecomprisingacomparatively hard metal body, two or more angular and soft-metal inserts of approximately the same transverse sectional areas throughout their length embedded in said body, and strips connecting the inserts and located at or adjacent to the back of the shoe.

3. A brake-shoe comprising a body, an insert embedded in said body, and a strip having a fiat under face connected to said insert and located at or adjacent to the back of the s cc.

4. A brake-shoe comprising a body, an insert embedded in said body, and a strip thinner at its edges than at its middle connected to said insert and located at or adjacent to the back of the shoe.

5. A brake-shoe comprising a body, an insert embedded in said body, and a half-oval strip connected to said insert and located at or adjacent to the back of the shoe.

6. A brake-shoe comprising an insert made with an opening on its upper side, astrengthening-strip arranged in said opening, and a body cast on said insert and strip.

7 In a brake-shoe, a body, and an insert embedded in said body and provided at its back with a crown undercut at its juncture with the body of the insert.

8. In a brake-shoe, a body, an insert embedded in said body and provided with a crown, and strips connected with said crown.

I/VILLIAM M. SIMPSON.

Witnesses:

U. E. SMITH, WM. 0. BELT 

